Eliglustat is a medication used to treat Gaucher disease, a rare genetic disorder. However, it is important to ensure the purity of eliglustat to ensure its efficacy and safety. Eliglustat impurities are substances that are not intended to be present in the medication and may affect its quality, purity, and potency. These impurities need to be monitored and controlled within acceptable levels during the manufacturing process to ensure the safety and efficacy of the medication.